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Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation.
Light: Science & Applications ( IF 20.6 ) Pub Date : 2020-04-16 , DOI: 10.1038/s41377-020-0293-0 Yuzhi Shi 1, 2 , Tongtong Zhu 3, 4, 5 , Tianhang Zhang 3 , Alfredo Mazzulla 6 , Din Ping Tsai 7 , Weiqiang Ding 5 , Ai Qun Liu 2 , Gabriella Cipparrone 6, 8 , Juan José Sáenz 9 , Cheng-Wei Qiu 3
Light: Science & Applications ( IF 20.6 ) Pub Date : 2020-04-16 , DOI: 10.1038/s41377-020-0293-0 Yuzhi Shi 1, 2 , Tongtong Zhu 3, 4, 5 , Tianhang Zhang 3 , Alfredo Mazzulla 6 , Din Ping Tsai 7 , Weiqiang Ding 5 , Ai Qun Liu 2 , Gabriella Cipparrone 6, 8 , Juan José Sáenz 9 , Cheng-Wei Qiu 3
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Lateral optical forces induced by linearly polarized laser beams have been predicted to deflect dipolar particles with opposite chiralities toward opposite transversal directions. These "chirality-dependent" forces can offer new possibilities for passive all-optical enantioselective sorting of chiral particles, which is essential to the nanoscience and drug industries. However, previous chiral sorting experiments focused on large particles with diameters in the geometrical-optics regime. Here, we demonstrate, for the first time, the robust sorting of Mie (size ~ wavelength) chiral particles with different handedness at an air-water interface using optical lateral forces induced by a single linearly polarized laser beam. The nontrivial physical interactions underlying these chirality-dependent forces distinctly differ from those predicted for dipolar or geometrical-optics particles. The lateral forces emerge from a complex interplay between the light polarization, lateral momentum enhancement, and out-of-plane light refraction at the particle-water interface. The sign of the lateral force could be reversed by changing the particle size, incident angle, and polarization of the obliquely incident light.
中文翻译：
手性辅助的横向动量传递，用于双向对映选择性分离。
线性偏振激光束引起的横向光学力已被预测会使具有相反手性的偶极子粒子向相反的横向方向偏转。这些“手性相关”的力可以为手性粒子的被动全光学对映选择性分选提供新的可能性，这对纳米科学和药物工业至关重要。然而，先前的手性分选实验关注的是直径在几何光学范围内的大颗粒。在这里，我们首次展示了使用单个线性偏振激光束所产生的光学横向力在空气-水界面上对具有不同手性的Mie（大小〜波长）手性粒子进行的稳健分类。这些依赖于手性的作用力的非平凡的物理相互作用明显不同于偶极或几何光学粒子所预测的相互作用。横向力是由粒子-水界面处的光偏振，横向动量增强和面外光折射之间的复杂相互作用产生的。可以通过更改倾斜入射光的粒径，入射角和偏振来反转横向力的符号。
更新日期：2020-04-24
中文翻译：
手性辅助的横向动量传递，用于双向对映选择性分离。
线性偏振激光束引起的横向光学力已被预测会使具有相反手性的偶极子粒子向相反的横向方向偏转。这些“手性相关”的力可以为手性粒子的被动全光学对映选择性分选提供新的可能性，这对纳米科学和药物工业至关重要。然而，先前的手性分选实验关注的是直径在几何光学范围内的大颗粒。在这里，我们首次展示了使用单个线性偏振激光束所产生的光学横向力在空气-水界面上对具有不同手性的Mie（大小〜波长）手性粒子进行的稳健分类。这些依赖于手性的作用力的非平凡的物理相互作用明显不同于偶极或几何光学粒子所预测的相互作用。横向力是由粒子-水界面处的光偏振，横向动量增强和面外光折射之间的复杂相互作用产生的。可以通过更改倾斜入射光的粒径，入射角和偏振来反转横向力的符号。
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